globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2017.04.005
Scopus记录号: 2-s2.0-85017574180
论文题名:
Gap regeneration within mature deciduous forests of Interior Alaska: Implications for future forest change
作者: Alexander H.D.; Mack M.C.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2017
卷: 396
起始页码: 35
结束页码: 43
语种: 英语
英文关键词: Alaska ; Black spruce ; Boreal forest ; Canopy gaps ; Fire ; Successional trajectory
Scopus关键词: Carbon ; Fires ; Reforestation ; Alaska ; Black spruce ; Black spruce (Picea mariana) ; Boreal forests ; Canopy gaps ; Ecosystem functions ; Implications for futures ; Populus tremuloides ; Forestry ; boreal forest ; canopy gap ; deciduous forest ; deciduous tree ; evergreen tree ; fire history ; forest dynamics ; gap dynamics ; regrowth ; succession ; Alaska ; United States ; Betula neoalaskana ; Betula papyrifera ; Bryophyta ; Picea mariana ; Populus tremuloides
英文摘要: Increased fire severity in boreal forests of Interior Alaska is shifting forest canopy composition from black spruce (Picea mariana) to deciduous species, including trembling aspen (Populus tremuloides) and Alaska paper birch (Betula neoalaskana). Because deciduous trees are less flammable than black spruce, the dominant disturbance regime in deciduous forests could move away from fire to one of gap disturbances. In this study, we quantified forest gap characteristics and vegetation within eight mature (62–119-yr-old) deciduous stands in Interior Alaska. Canopy gaps were generally small (true gap area <50 m2), formed by the mortality of 4–16 gap makers (which were always deciduous trees), and occupied ∼17–29% of the forest except in the oldest stand, where gap fraction exceeded 45%, and in one anomalous 84-yr old stand, where gaps were absent. Canopy openness increased linearly with gap area, but density of both deciduous and evergreen tree recruits was generally low and insufficient to create future stands with densities similar to those currently found in mature stands across the landscape. Canopy openness was instead correlated with decreased leaf litter cover and increased cover of moss, lichen, and evergreen shrubs. Given the low recruitment of trees with canopy gaps and the decreased probability of fire, deciduous stands will likely transition to non-forested areas or low density stands once overstory trees reach maturity and die. This could have numerous implications for ecosystem function, including carbon (C), water, and energy balance, and potential feedbacks to future fire occurrence and regional climate. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64342
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Forestry, Forest and Wildlife Research Center, Mississippi State UniversityMS, United States; Northern Arizona University, Center for Ecosystem Science and Society, 224 Peterson Hall, Flagstaff, AZ, United States

Recommended Citation:
Alexander H.D.,Mack M.C.. Gap regeneration within mature deciduous forests of Interior Alaska: Implications for future forest change[J]. Forest Ecology and Management,2017-01-01,396
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